排序 javascript object 而不更改它的键值

Question

I have below type of object, I want to sort on based on sort_value of object. I tried below solution but it gives me error.

var data = {
        7:{
            name: 'Test1',
            city: 'Mohali',
            sort_order: -1
        },
        9:{
            name: 'Test2',
            city: 'Delhi',
            sort_order: 2
        },
        10:{
            name: 'Test3',
            city: 'Chicago',
            sort_order: 0
        }
    }

I Tried this one solution

data.sort(function(a, b) {
    return parseFloat(a.sort_order) - parseFloat(b.sort_order);
});

Gives me error like this

Uncaught TypeError: data.sort is not a function

Expected Output

var Expectedop = {
        7:{
            name: 'Test1',
            city: 'Mohali',
            sort_order: -1
        },
        10:{
            name: 'Test3',
            city: 'Chicago',
            sort_order: 0
        },
        9:{
            name: 'Test2',
            city: 'Delhi',
            sort_order: 2
        }
    }

Answer 1

sort is an in-built method available on Arrays.

What you can do is use Object.keys(data) which will give you array of keys ( [7,9,10] ) and sort it using the sort function. When you have the keys sorted in the array, you can use them to update sort_order in the data object.

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys